American Magnetics 187 Self-Compensating Liquid Level Controller - Manual (Page 22)

11
Installation
Verifying power requirements
2.6 Connecting the Instrument to Power
Warning
The Model 187 operates on 50-60 Hz power and may be configured
for 100-120 or 200-240 VAC ±10%. The power requirements for each
instrument is marked on the calibration sticker on the bottom of the
instrument. Verify that your instrument is configured for your
power source prior to plugging in the line cord. Do not fail to connect
the input ground terminal securely to an external earth ground.
Verify that the instrument is configured for the proper operating voltage
by referring to the calibration sticker affixed to the bottom of the
instrument. If the operating voltage is correct, plug the line cord into the
appropriate power receptacle.
If the instrument operating voltage needs to be changed, ensure the
instrument is de-energized by disconnecting the power cord from the
power source. Remove the instrument cover and slide the voltage selector
switch on the main printed circuit board to the proper voltage. Replace the
instrument cover.